The Titans have said all the right things about Zach Mettenberger, but based on what we saw from him in 2014, there are considerable questions about his NFL ceiling. Offensive fit and the ability to adapt are big questions around Mariota, but he's an elite talent and has the chance to be special if a team is patient with him. Mariota has a great work ethic, exceptional athletic tools, enough arm to drive the ball down the field and on intermediate throws and he did improve in his ability to get through progressions, anticipate and deliver with good placement this season. The question is whether he can look as special outside the confines of the Oregon offense. If Tennessee doesn't like either of the top two quarterbacks, this is a pretty obvious trade-up position.
Mariota is a terrible fit for Ken Whisenhunt's offense. I wouldn't be surprised to see the Titans taking Jameis Winston if he is still on the board here, although I don't want that, but I really can't see them taking Mariota.